package com.openhouseautomation.cron;
import static com.openhouseautomation.OfyService.ofy;
import com.openhouseautomation.model.Forecast;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
/**
*
* @author dras
*/
public class WeatherForecast extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final Logger log = Logger.getLogger(WeatherForecast.class.getName());
String surl =
"http://graphical.weather.gov/xml/SOAP_server/ndfdXMLclient.php?whichClient=NDFDgenMultiZipCode&product=time-series&Unit=e&maxt=maxt&mint=mint&pop12=pop12&Submit=Submit";
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/plain;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
// first, get the zip code
String zipcode = request.getParameter("zipcode");
if (zipcode == null || "".equals(zipcode)) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Missing zipcode");
return;
}
long curtime = System.currentTimeMillis();
// TODO: change the param to read the list of zips from DS/Obj
URL url = new URL(surl + "&zipCodeList=" + zipcode);
// the URL returns an XML doc
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(url.openStream());
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression exprmin =
xpath.compile("/dwml/data/parameters/temperature[@type='minimum']/value[1]");
String minimum = (String) exprmin.evaluate(doc, XPathConstants.STRING);
// update datastore
Forecast forecast = ofy().load().type(Forecast.class).id(zipcode).now();
if (forecast == null) {
forecast = new Forecast();
forecast.setZipCode(zipcode);
}
forecast.setForecastLow(minimum);
XPathExpression exprmax =
xpath.compile("/dwml/data/parameters/temperature[@type='maximum']/value[1]");
String maximum = (String) exprmax.evaluate(doc, XPathConstants.STRING);
forecast.setForecastHigh(maximum);
XPathExpression exprpop =
xpath.compile("/dwml/data/parameters/probability-of-precipitation[@type='12 hour']/value[1]");
String pop = (String) exprpop.evaluate(doc, XPathConstants.STRING);
forecast.setForecastPop(pop);
forecast.setLastUpdate(new Date());
log.log(Level.INFO, "forecast cron took " + (System.currentTimeMillis() - curtime) + "ms");
ofy().save().entity(forecast).now();
out.println(forecast);
} catch (Exception e) {
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}